© STIHL Inc., Virginia Beach, VA 2013 US/STR
confidential
20. Fuel Filter
It is a good idea to backflow a fuel filter with the pressure
pump to verify that it is not restricted
Hook up the tester and place the filter on a towel and pump
the tester 2 times
No pressure should build up and if the filter is wet with fuel
it should clearly flow out
© STIHL Inc., Virginia Beach, VA 2013 US/STR
confidential
21. Pressure Test Fuel Line
Connect the pressure tester to the fuel line where the filter was
removed and gently pump it up no higher than 10 PSI
If it holds steady then the fuel line is OK, and the carb itself
passes the pressure test
If the gauge does not
hold then either the fuel
line or the carb may be
leaking, so isolate the
fuel line and test it by
itself to determine
where the fault is
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